Electrical driving device for a rapidly rotating member, such as a spinning pot for artificial silk



' March ELECTRICAL muvmcsucu AS A'SPINN BBERHUIZEN 94.286

FUR A RAPIDLY ROTATING ER,

POT FOR ARTIFICIAL SILK A 0v. 2]., 1938 2 Sheets-Sheet 1 fr; de x201? 3Jan Willem lzzer/wza'zm March 1940- J. W. LUBBERHUIZEN 2,194,

ELECTRICAL DRIVING DEVICE FOR A RAPIDLY ROTATING MEMBER, SUCH AS ASPINNING POT FOR ARTIFICIAL SILK Filed Nov. 21. 1938 2 Sheets-Sheet 2 V1 i \l I/"" \i l 3 i 5 i I 5 F i i g 5L l I l r I 'l 41" I '2 1 I i i ii i 1 I l Z7 1 k 1 l 22 I 1% I I I I F 29 i J k 1 /1 20 JJ l 20 13 6frzderziarr- W W m Patented 1940 UNITED STATES OFFICE BAPIDLY ROTATINGMEDIBER, SUCH AS A SPINNING POT FOR ARTIFICIAL SILK Jan WillemLubberhuizen, Lobositz, Sudetenland, Germany, assignor to N. V.Internationale Splnpot' Exploitatie Maats'chapplj Isem,Doetlnchem,Netherlands, a corporationo! the Netherlands Application hlovember 21, 1938, SerlalNo. 241318 In the Netherlands September 17,1937 1 clai (01. 17mm The invention relates to an electrical drivingdevice for rapidly rotating members, in particular spinning pots forartificial silk, comprising a vertical spindle supported in a'hollowrotor shaft.

The invention has for its object a convenient and practical embodimentof such a driving device so as to provide for a very simple insertionand removal of. the electromotor as well as of other essential elementsof the device into andfrom a surrounding casing.

According to the invention the casing surrounding the vertical spindle,the hollow rotor shaft, a rotor mounted on said shaft and a statorforming with said rotor the electromotor driv ing the hollow rotor shaftand thereby the spindle, comprises a lower portion and an upper portionor cap through which latter portion the spindle freely protrudes, saidcap being adapted to' be connected to and removed from the lower casingportion by a simple manipulation and constituting when connected to saidlower casing portion the sole means for keepingtogether the spindle,rotor, rotor shaft and bearings oi the driving device, while preventingthem from being taken apart.

According to the invention the spindle may be axially slidably butnon-rotatably coupled with the hollow rotor shaft so as to be adapted tobe readily inserted into and withdrawn from the hollow rotor shaft afterremoval of the cap. The hollow rotor shaft may according to the inven:tion be supported exclusively underneath the stator or rotorin bearingsof such a type, that after removal of the cap it may be axiallywithdrawn or inserted without disturbance of any connection.

invention the lower end of the spindle'has such a profile that simplyafter insertion of the pindle' into the hollow rotor shaft a relativ thespindle may have a transverse slot open at the bottom and, in theoperative position of the spindle, straddling a ,transverse pin securedin two or more parts. It may be flexible so as to adjust itself underits proper elasticity independently of any springs.

According to the invention the rotor shaft may be supported in combinedaxialand radialrotation of said elements is prevented. To this endthrustbearing adapted to receive the axial pressure. As an alternativeone of, the said bearings may be an axial thrustbearing, receiving the.

axial pressure, and the other bearing may be a tubular bearing. Themotor cap may be provided with an abutment limiting upward dis-'placement of the rotor shaft and e. g. consisting of a sleeve which maybe flanged and which surrounds the spindle with some play in such amanner, that after the cap has been secured to the stator the essentialelements such as the rotor shaft, carrying the rotor, the spindle andthe bearings are held together.

According to the inventtion the motor may be supported upon elastic e.g. rubber feet or shock absorbers, rigidly secured to the casing.

This way of resiliently supporting the motor is generally known. Inknown constructions, howthe consideration that the motor, upon beingstarted and'as long as the number of revolutions has not yet reached thefirst critical number, should be able to follow the oscillatingmovements of the spinning pot. The motor should then-be able to make anoscillating movement on the shock absorbers which movement at the top ismuch stronger than at the bottom. Therefore the motor has a tendency totilt whereaiter it is returned by its own weight into the verticalposition. .When. supporting the motor on a'plurality of shock absorberssome of them will be slightly lifted and the oppositelylocated shockabsorbers will be slightly compressed. If the motor has surpassed itscritical number oiirevolutions then during the rotation of the spinningpot the axis of gravity remains in position and the motor should then beable to perform a small precession motion at the bottom. Based onthLs:insight the invention consists in this that the shock absorbers eachhave a portion that is freely slidable over centering pins or incentering holes of the foundation or stationary motor support whereasbetween the upper side of said pins or holes and the lower side of themotor casing there is a laterally non-clamped or free ShOCk flbSOl'b:er-length.

The shock absorbers are thus verticaliypompressible while atthe sametime "the amount of play between the shock absorber portion surF-rounding the centering pin or inserted into the centering hole of thestationary support enables the motor to be tilted and to fallbackin alimiteddegree. The motor. once having reached its normal number ofrevolutions, the laterally free slrocke'absorbezz-length rederred toabove may be slightly distorted by the shearing stresses produced; inthe case of a laterally clamped in shock absorber this would beimpossible and also in the case of a shock absorber rigidly attached tothe motor by means of a bolt or pin passing therethrough. Thus,according to the invention, a free shock absorber length affording theshock absorbing efiect is combined with a shock absorber length for thecentering of the motor.

Further features of the invention will be described hereinafter withreference to the accompanying drawings, in which Fig. 1 is a verticalcentral section of an elec= trlcal driving device according totheinvention e.g. of a spinning pot for artificial sillri Fig. 2 is asection perpendicular to that shown in Fig. 1 of a detail.

Figs. 3, 4 and 5 are vertical sections of three embodiments of shockabsorbers for an electromotor-driven vertical centrifugal machine according to the invention.

Fig. 6 is a vertical section of anelectrical driving device for aspinning pot essentially corresponding to Fig. 1 but illustratingvarious structural details which in Fig. l have only been shownschematically.

In Figs. 1 and 2 a vertical spindle l, upon the upper end of which aspinning pot may be mounted, has been inserted into the hollow shaft 2of a rotor is which together with a stator 5 con-- stitutes theelectromotor driving the spindle. The spindle is, axially slidable butnon-rotatable with respect to the hollow rotor shaft by reason of thefact that the lower end of the spindle is provided with a slot 5 whichin the position shown in Figs. 1 and2 receives a transverse pin 8 se=cured in the lower end of the hollow rotor shaft (see Fig. 2). Thespindle maybe removed firom the hollow rotor-shaft by taking out axiallyand upwards. Radial or transverse springs l are arranged in a springchamber ll secured to the top of the rotor 3 and rotating alongtherewith. The springs serve to laterally support the spindle at theupper end by means of a collar it. A can 9 has been putover the spindlel and is provided with a sleeve portion It provided at its lower endwith a flange ll, said sleeve surrounding the spindle with the necessaryplay and preventing the spindle or the rotor from freely movingupswards. .Jhe cap at its lower edge is provided with an annular bead ll adapted to receive under tension an annular spring is for securing thecap to a stator casing it. The spring is of the type shown in dottedlines and is constituted by a resilient wire in the form of a split ringhaving outwardly projecting ends 2d, 2@ adapted to be moved towards oneanother so as to-reduce the diameter of the spring and thereby unlockthe cap 9. Insertion and removal or the spindle as well/as of the motorand bearings is thus very simple. Screw connections need not beestablished or unscrewed. it will be clear that the invention in itsbroad respect is not limited to the use of the particular springreierred to above. Otherconnecting means suchas a bayonet joint toconnect the cap to and disconnecting it from the stator casing it by asimple manipulation might also be used. The hollow rotor shaft i issupported exclusively underneath the stator t in two superposed andspaced bearings I2 and i3 shown schematically in Fig. 1 and in detail inFig. 6. They creases device may be mounted freely and in a centeredposition upon a stationary support without being rigidly connectedthereto.

Within the spirit of the invention it is possible .to couple the lowerspindle end to the hollow rotor shaft in any other way than shown inFig. l. The spindle at its lower end might have laterally projectingribs received in corresponding ver tical longitudinal grooves in thelower wall portion of the hollow rotor shaft so that the spindle may beinserted from above with said ribs into the grooves oi said wall portionwhich to this end will have to be thicker than the wall portion locatedthereabove.

In Fig. 3 inthe lower side oi the casing id, in a recess defined by adepending collar 20, the upper end or a rubber shock absorber 22 isclamped. This shock absorber is in its bottom provided with a recess 23into which projects with some circumferential play a centering pin 2dupon the upper surface of which the rubber shock absorber is supportedwith the bottom of its recess. The lower end surface 26 of the shock vabsorber is located at some distance above the foundation .or stationarysupport 25 vinto which the centering pin 26 is secured. It .iollows thatthere is a laterally non-clamped or free shocl: absorber length abetween the lower side oi casing id and the upper sidecf the pin 2d andthat further the rubber shockabsorber will compressed between saidsurfaces. The rubbar is thus confined between said surfaces and is notsubjected to tensile stress. v

in Fig. 4 the rubber shock absorber :22 is clamped in the casing it bymeans of a relative ly thin portion 'Z'l having at its upper end acollar or thickened head 23. For the rest this embodimnt is equivalentto that according to 3.

In 5 the rubber shock absorber 22 is pro vided at its upper end with acollarless relatively thin portion ill clamped in the casing it. At

' lower end the shock absorber 22 is provided with a relatively thinportion 29 which is insefied with circumferential play into a hole 3d ofthe stationary support 26., The shock absorber 22 is tionary support 26and the lower side at the v casing it and again there is a laterallynonclarnped or free shoclr-absorber-length, denoted by b, between thecasing and the stationary support. The lower end of the shock absorberat St is entirely free.

In Fig. 6 it has been clearly shown that the bearings l2, it otthehollow rotor shaft t are combined radial-axial-thrustbearings. Theshock-absorbers enact the type shown separtely in Fig. 5 Thespindleisoi. the type disclosed e. g. in the U. S. patent specification No.2,089,933, but it may of course beof other type, e. g. oi the type shownin Figs. 1 and 2.

I claim:

A two-parthousing for motors and the like comprising a pair of separablehousing members, one of said members constituting a cover and he othermember a base, said cover having an aperture through the top thereof, anannular sleeve portion projecting downwardly from said covercircumferentially of said aperture, said sleeve portion having anoutwardly extending annular flange at its lower edge, said sleeve andaperture adapted to receive the spindle or the motor rotorthere-through, said spindle having a collar flxe'd' thereto adjacent theupper end thereof, said base supporting the stator of the motor andhaving a pair of spaced bearings for the motor rotor; said cover havingan annular bead along the lower edge thereof, a wire spring receivedwithin said head, said base having a laterally extending peripheralflange along its upper edge, said wire spring having a smaller innercircumference than the outer circumference of said lateral flange, saidlateral flange being adapted to extend over and frictionally engage theupper side of said spring when said cover is secured to said base, andmeans for reducing the outer circumference of said spring to conform toor be less than the circumference of said laterally extending flange,

whereby said cover and its sleeve may be removed as a unit from saidbase, said spindle being prevented from upward movement by its collarand a flanged sleeve when the cover is operatively secured to said base.

JAN wnmm LUBBERHUIZEN.

